Control valves conquer deep-sea challenges
A
Pump Engineering product story
Edited by the Engineeringtalk editorial team
Aug 7, 2006
Meter control valves make an important contribution to oil extraction in ultradeep oil wells where they are subject to extreme pressures, wide flow ranges and very low temperatures.
Badger meter control valves, available in the UK through Pump Engineering, are making an important contribution to oil extraction in ultradeep oil wells where the ability to overcome the difficult challenges associated with these applications, such as extreme pressures, wide flow ranges and very low temperatures, is extremely important.
As a consequence of increasing global demand and escalating fuel prices, particularly since the mid 1990's, oil and gas production has increased significantly at much greater depths.
While market forces have driven the need for production companies to "push back the boundaries" and extract oil and gas from greater depths, technological advances have been required to overcome the challenges to enable safe and efficient deep sea oil extraction.
For example, as oil and gas production moves to deeper waters, flowline pressures rise and seawater temperatures fall and this can result in the formation of hydrates.
If these ice-like hydrates are left unchecked they can deposit on the inner wall of flowlines and agglomerate, until they completely block the flow line.
To eliminate the potential problem of hydrates forming in flowlines at these depths and pressures, chemical additives, such as methanol or mono ethylene glycol, are injected into the wellstream.
These additives act as anti-freeze and are effective in preventing hydrates from forming and therefore play a key role in helping to keep flowlines open.
For example, The Badger Valve Company, represented in the UK by Pump Engineering, was challenged to manufacture 1in valves that could handle ethylene glycol at flows up to 220 litre/min at 700bar.
These valves were successfully deployed in deep water oilfields in the Eastern Gulf of Mexico where pressures are relatively high and temperatures relatively low and therefore the risk of hydrates forming is high.
Additive and injection applications are ideal for these valves as they are suited to both low pressure and high pressure duties.
The Badger range includes models ranging in size from 0.25 to 2in, capable of operating in temperatures from -270 to +800C, with CV's from 0.000018 to 2.5 and rangeability from 50:1 to 15:1.
They can be supplied as standard in 316 stainless steel with stainless steel or Stellite trims, although alternative materials such as Monel, Hastelloy B and C, titanium and zirconium, can also be specified.
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